Cylinder deglazing tool



May 7, 1968 B. L.. JOHNSQN CYLINDER DEGLAZING TOOL Filed Oct. 28, 1965 United States Patent O 3,381,419 CYLINDER DEGLAZlNG TOOL Berd L. Johnson, 2625 128th St., Brookfield, Wis. 53005 Filed Oct. 28, 1965, Ser. No. 505,568 14 Claims. (Cl. 51-332) This invention relates to a new and improved roughing and finishing tool of the same general type as that disclosed in my Patent 2,611,222 for use in engine cylinder jobs for deglazing, namely, removal of the glaze in the bores so that new piston rings may wear down quickly to a correct close lit.

The principal object of my invention is to provide a deglazing tool having abrading devices of elongated form disposed substantially parallel to the vertical axis of the rotating head and pivotally mounted intermediate their ends on and weighting as iiy-weights the lower ends of a set of relatively long radius arms that are pivotally connected with the head, while a vertical drive stem turning with the head carries a coiled compression spring that is caged between the head and a lower head that is threadedly adjustable on the lower end of the stem and connected by means of another set of shorter radius arms with the abrading devices at the same pivotal points as the first mentioned radius arms, the threaded adjustment predetermining the radius to which the abrading devices can be projected radially in a cylinder bore, while the spring causes substantially the same radial pressure to be exerted by the abrading devices on the walls of the cylinder in all conditions of adjustment, due largely to the increase in the leverage angle of the lower radius arms in their lower positions of adjustment of the lower head which compensates for the lessening of spring compression with the elongation thereof, and due partly also to the greater centrifugal force active on the abrading devices when operating on a larger radius.

Another object is to provide the longer radius arms in the form of leaf springs with half-round bent upper and lower end portions to provide bearings, these upper end portions being pivotally engaged in one of two annular grooves in the upper head and having an O-ring stretched in the groove and engaged in and holding the bearing ends of the radius arms in place in the groove with freedom of pivotal movement, while the arms are also guided in vertical grooves provided in the periphery of the head and are surrounded by another O-ring stretched in a lower annular groove in the head serving to keep the arms engaged in the vertical grooves while urging the same radially inwardly to retracted position, thus providing a simple and economical assembly and one that is still quite practical and serviceable, the bearing portions on the lower ends of the leaf springs having pivotal connections with pivot pins that pivotally connect the lower set of radius arms with the abrading devices.

Still another object is to provide quickly attachable and detachable abrading or honing devices made of ernery or other metal working cloth as the abrasive, commonly referred to as metal cloth, each such hone unit comprising a roll of metal cloth on a strip that is arranged to be clamped to a carrier bar by means of screws extending through holes in the ends of the strips and threaded in holes in the carrier bar, thus enabling the cloth roll lirst to be freed by loosening the screws and then turned to pay out the worn out end portion that can be cut or torn oit after the screws have been tightened again to clamp the roll in its adjusted position, thereby reducing waste to a minimum and enabling most economical use of the metal cloth.

Another object is to provide honing stones also easily attachable and replaceable. The stones, which are pieces of Carborundum or other similar grinding or honing material, may be cemented in channel strips that have lugs punched from the web portions thereof and arranged to be extended through slots provided in the web of a carrier channel strip and clinched over, whereby to enable easy replacement of stones without necessity for removal of the carrier strips from the tool.

The invention is illustrated in the accompanying drawing, in which- FIGS. 1 and 2 are, respectively, a plan view and a side view of a cylinder deglazing tool made in accordance with my invention;

FIG. 3 is a fragmentary side view looking squarely at one ofthe three sub-assemblies;

FIG. 4 is a fragmentary sectional detail on the line 4--4 of FIG. 2;

FIGS. 5 and 6 are perspective viewsI showing a moditied construction in which the stones are available on separate channel backing bars that are easily removable and replaceable on the channel carrier bars to reduce time loss when stones become worn and have to be replaced, and

FIGS. 7 and 8 are a side view and a partial perspective showing another modification in which a roll of metal cloth is substituted for a stone for honing purposes.

Similar reference numerals are applied to corresponding parts throughout the views.

Referring lirst to FIGS. 1 to 4, the reference numeral i4 designates elongated stones of Carborundum or the like for honing contact with the cylinder wall, these being pivotally connected intermediate their ends on the outer ends of channel shaped radius arms 5 that are pivotally connected at their inner ends to a ran-ge nut or lower head 6 threadedly adjustable on the threaded lower end 7 of a vertical drive stem `8 disposed on the axis of the deglazing tool and reciprocable in a center hole 9 in the upper head or hub 10. A lock nut 11 threading on stem 8 locks the range nut 6 in its adjusted position. The nut 6 is shown in FIG. 2 set up for operation in a small bore; it is set down lower, for a larger bore, A coiled compression spring 12 is caged between the heads 6 `and 1l)` normally to urge them apart and accordingly urge the stones 4 radially outwardly into engagement with the wall of the cylinder, due to the fact that the head 10 is connected by means of a set of leaf spring radius arms 13 with the stones 4 as indicated at 14 and 15. The connections 14 are designed for low cost assembling, and each consists of a half-round bent end 16 on the leaf spring arm 12 engaged in an annular lgroove 17 of similar form provided in the head 10 while a rubber or neoprene O-ring 18 stretched in the groove 17 and engaged. in all of the inwardly bent ends 16 of the arms 12, serves to hold the parts in place with freedom for easy pivotal motion. Vertical grooves 19 in the periphery of the head 10 serve as guides for the pivoted upper end portions of the longer radius arms 13 and allow them to oscillate freely relative to the head 10 without danger of displacement from proper relationship to one another in the head. A second Oring 20 stretched in a lower annular groove 21 provided in the head extends around the radius arms 13 to maintain their assembled relationship to the head 10 at all times, The outwardly bent halfround `bearing portions 15 on the lower ends of the radius arms 13 are bent outwardly, as seen best in the broken away lower right hand portion of FIG. 2, to engage the outer side of the pivot pins 22 that pivotally connect the outer ends of the radius arms 5 with the channel shaped carrier bars 23, onto which the stones 4 are cemented along the lines 24, the pins 22 extending through the tianges of the channels 23 in such spaced relation to the webs 25 that there is just room enough left between the pins 22 and the webs to provide operating clearance for the half-round bearing portions 15.

In operation, the coupling head 26 which, as shown in dotted lines in FIG. 3, is threaded onto the upper end 27 of the stern 8, leaving sutiicient length of threaded bore 23 above the upper end of the stern for threaded reception of the lower end of a drive shank 29, is arranged to be driven by connection of the shank 29 with the chuck of an electric drill, for example. On the other hand, the coupling 26 may be connected with the end of a flexible drive shaft for greater convenience generally in the manipulation of the tool in that it can more readily be moved from one bore to another in a cylinder block, The stones 4 vin entering a lbore are moved by hand close enough together before the power is turned on, and the spring 12 will, of course, immediately thereafter cause the stones to be projected outwardly under spring pressure into contact with the cylinder walls. This spring pressure is active throughout the deglazing operation, centrifugal force also causing further pressure. The range nut 6 can be adjusted up or down for a desired range, or it can be left in a lower position for a wide range whichever the operation prefers. The relationship of the radius arms 5 to the spring 12 is such that even though there is less compression of the spring 12 when the range nut 6 is given a lower setting for operation of the tool in a larger size bore, the pressure -of spring 12 holding the stones 4 in honing contact with the cylinder wall remains substantially the same, due to the fact that there is then an increase in the leverage angle of the radius arms S, as should be clear from examination of FIG. 2. Also any decrease in spring pressure while operating in a larger size bore is compensated for by the increase in centrifugal force. The radius arms 13 are made of leaf springs for lightness in relation to channel members like the ones shown at 5 and to flex readily to whatever extent may be necessary for smooth and uniform operation of the abrading devices 4 in the bore.

Referring to FIG. 5 and FIG. 6, the stones 4 are shown cemented in channel strips 3f) which have lugs 31 struck from the web 32 and extended through slots 33 provided in the web 34 of the carrier strip 23' and bent over to clinch the connection of the two channel strips and 23', whereby to enable easier replacement of stones when that becomes necessary due to breakage or wear. With this construction there is no necessity for disassembling the lower portion of the deglazing tool merely to replace a stone or stones.

In a similar vein, I have shown in FIGS. 7 and 8 how rolls of metal cloth 4 may be provided on thin metal strips 35 and each roll clamped by means of screws 36 extending through holes in the ends of a strip and threaded in holes in the carrier bar 23, thus enabling a ro-ll first to be freed by loosening the screws and then turned to pay out the worn out end portion that can be cut or torn off after the screws have been tightened again to clamp the -roll in its adjusted position, thereby reducing waste to a minimum and enabling most economical use of the metal cloth.

It is believed the foregoing description conveys a good understanding of the objects and advantages of my invention. The appended claims have been drawn to cover all legitimate modifications and adaptations.

I claim:

1. In a tool of the character desc-ribed, a rotating head, a vertical drive stem for the tool extending through a central axial bearing in said head, elongated radius arms extending lengthwise relative to and Idisposed in circumferentially spaced relation around said stem and pivoted at their upper ends on said head at circumferentially spaced points, a .range nut threaded on said stem below said head and having other radius arms pivoted thereto at their inner ends in circumferentially spaced relation and extending outwardly therefrom and pivotally connected with the lower ends of said first radius arms, abrading devices of elongated form disposed substantially parallel to the stem and pivotally mounted intermediate their ends on the pivotally connected ends of said radius arms and weighting the latter as fly-weights, and spring means urging said abrading devices radially outward for contact with the walls of a bore in which said abrading devices are to operate.

2. A tool as set forth in claim 1 wherein said range nut is disposed above the level of the pivotally connected ends of said radius arms, and said spring means comprises a coiled compression spring caged on said stem between said range nut and head ten-ding to move the same apart and thereby urge the abrading devices radially outwardly.

3. A tool as set forth in claim 1 wherein said range nut is disposed above the level of the pivotally connected ends of said radius arms, and said spring means comprises a coiled compression spring caged on said stem between said range nut and head tending to move the same apart and thereby urge the abrading devices radially outwardly, there being means on said stem which by abutment with said head limits the projection of said abrading devices under action of said spring.

4. A tool as set forth in claim 1 wherein said range nut is disposed above the level of the pivotally connected ends of said radius arms, and said spring means comprises a coiled compression spring caged on said stem between said range nut and head tending to move the same apart and thereby urge the abrading devices radially outwardly, and a coupler head on the upper end -of said stem for connecting the same with a driver, the same serving by abutment with said first named head to limit the projection of said abrading devices under action of said spring.

5. A tool as set forth in claim 1 wherein said range nut is disposed above the level of the pivotally connected ends of said radius arms, and said spring means comprises a coiled compression spring caged on said stem 4between said range nut and head tending to move the same apart and thereby urge the abrading devices radially outwardly, the range nut being limited in its adjustment to a position approximately in the same horizontal plane with the pivotally connected ends of said radius arms.

6. A tool as set forth in claim 1 including means for positively limiting projection of said abrading devices within the possible reach of said interconnected radius arms.

7. A tool as set forth in claim 1 wherein the first mentioned radius arms are appreciably longer than the last mentioned radius arms, the latter extending Iupwardly from their pivotal connection with the first mentioned yarms for pivotal connection with the range nut.

I8. A tool as set forth in claim 1 wherein the first mentioned radius arms are appreciably longer than the last mentioned radius arms, the first mentioned radius arms being liexible leaf springs and the last named arms lbeing of relatively rigid construction.

9. -A tool as set forth in claim 1 wherein the first mentioned radius arms are exible leaf springs Ahaving substantially semi-circularly bent upper ends pivotally received in an annular groove provided in said head and guided for oscillatory motion relative to said head in vertical grooves provided in the periphery of said head, there being a ring of resilient stretchable material stretched in said annular groove and seated in said semicircularly bent upper end portions of said leaf springs to retain the same in assembled relationship to said head.

10. A tool as set forth in claim 1 wherein the first mentioned radius arms are iiexible leaf springs having substantially semi-circularly bent upper ends pivotally received in an annular groove provided in said head and guided for oscillatory motion relative to said -head in vertical grooves provided in the periphery of said head, there being a ring of resilient stretchable material stretched in said annular groove and seated in said semicircularly bent upper end portions of said leaf springs to 'retain the same in assembled relationship to said head,

said head having Ianother annular groove provided therein spaced below said rst annular groove in which another ring of resilient stretchable material is stretched and disposed in encircling relationship to the upper end portions of said leaf springs below their pivoted upper ends.

11. A tool as set forth in claim 1 wherein each abrading device comprises an elongated metallic carrier bar of channel form having a web portion land longitudinally extending flanges and having a honing stone cemented on its web portion, the flanges of the bar having the two sets of radius arms pivotally connected therewith.

12. A tool as set forth in claim 1 wherein each abrading device comprises an elongated metallic carrier bar of channel form having a `web portion and longitudinally extending flanges and having a honing stone cemented on its web portion, the anges of the bar having the two sets of radius arms pivotally connected therewith, one of the last mentioned radius arms being directly pivotally connected at its outer end to said flanges by a cross-pin, and one of the first mentioned radius arms having a semicircularly bent lower end portion pivotally engaging said cross-pin between the pin and the web portion of the channel.

13. A tool as set forth in claim 1 wherein each abrading device comprises an elongated metallic carrier bar of channel form having a web portion and longitudinally extending anges and having another channel bar disposed in opposed relationship thereto and fastened thereto detachably by its web portion, said otherI channel `bar having a honing stone cemented therein in its channel and projecting beyond the anges thereof.

14. A tool as set forth in claim 1 wherein each abrading device comprises an elongated metallic carrier bar of channel form having a web portion and longitudinally extending flanges and having a roll of abrasive cloth clamped on its web portion longitudinally of the bar by means of a metallic strip extending through said roll and fastened by screws at its opposite endls to the opposite end portions of said channel har.

References Cited UNITED STATES PATENTS 2,212,159 8/1940 Hingle 51-352 2,348,132 5/1944 Hyland 51--351 X 2,560,727 7/ 1951 Keiser 51--351 X 2,611,222 9/1952 Johnson 51-332 2,932,137 4/1960 Barrett 51-352 LESTER M. SWINGLE, Primary Examiner.

D. G. KELLY, Assistant Examiner. 

1. IN A TOOL OF THE CHARACTER DESCRIBED, A ROTATING HEAD, A VERTICAL DRIVE STEM FOR THE TOOL EXTENDING THROUGH A CENTRAL AXIAL BEARING IN SAID HEAD, ELONGATED RADIUS ARMS EXTENDING LENGTHWISE RELATIVE TO AND DISPOSED IN CIRCUMFERENTIALLY SPACED RELATION AROUND SAID STEM AND PIVOTED AT THEIR UPPER ENDS ON SAID HEAD AT CIRCUMFERENTIALLY SPACED POINTS, A RANGE NUT THREADED ON SAID STEM BELOW SAID HEAD AND HAVING OTHER RADIUS ARMS PIVOTED THERETO AT THEIR INNER ENDS IN CIRCUMFERENTIALLY SPACED RELATION AND EXTENDING OUTWARDLY THEREFROM AND PIVOTALLY CONNECTED WITH THE LOWER ENDS OF SAID FIRST RADIUS ARMS, ABRADING DEVICES OF ELONGATED FORM DISPOSED SUBSTANTIALLY PARALLEL TO THE STEM AND PIVOTALLY MOUNTED INTERMEDIATE THEIR ENDS ON THE PIVOTALLY CONNECTED ENDS OF SAID RADIUS ARMS AND WEIGHTING THE LATTER AS FLY-WEIGHTS, AND SPRING MEANS URGING SAID ABRADING DEVICES RADIALLY 